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环境化学  2015 

DOI:10.7524/j.issn.0254-6108.2014.01.009

Keywords: 二(口恶)英,同位素稀释法,高分辨磁质谱,串联质谱

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Abstract:

采用同位素内标稀释-高分辨气相色谱-高分辨质谱法同时测定土壤及沉积物样品中PCDD/Fs、PBDD/Fs、DL-PCBs和PBDEs4种二(口恶)英类持久性有机物的含量.利用凝胶渗透色谱、多层酸碱硅胶净化柱、活性炭分散硅胶净化柱对不同二(口恶)英类污染物具有不同吸附特性的特点,运用不同极性的溶剂淋洗,实现二(口恶)英组分(PCDD/Fs、PBDD/Fs)和其他两个组分(DL-PCBs、PBDEs)的分离,排除了同系物间及其他物质的干扰.所建方法的精密度变化范围在1.4%—13.6%之间,净化内标回收率范围在76%—111%之间,PCDD/Fs和PBDD/Fs的检出限分别在0.048—0.153pg·g-1和0.044—0.395pg·g-1之间,DL-PCBs和PBDEs的检出限分别在0.028—0.105pg·g-1和0.034—10.2pg·g-1之间,目标物检测结果大部分在质控样品标准范围之内,本文所建立的方法可以用于土壤及沉积物中PCDD/Fs、PBDD/Fs、DL-PCBs和PBDEs的同时净化分离.

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